Digital television receiver including non-volatile memory

Abstract

A digital television receiver comprises first program rewriting unit for downloading a program sent by broadcasting to rewrite the contents of a first non-volatile memory, an electrically rewritable second non-volatile memory storing identification information indicating whether the program has been normally rewritten by the program rewriting unit or the program has not been normally rewritten by the shutoff of the power during the rewriting, and second program rewriting unit for checking the identification information when a control portion in the receiver is activated, and downloading the program sent by broadcasting again to rewrite the contents of the first non-volatile memory when it is detected that the program has not been normally rewritten.

What is claimed is:  
     
       1. A television receiver comprising: 
       a control portion for controlling the whole of the receiver;  
       an electrically rewritable first non-volatile memory storing an execution program for the control portion;  
       first program rewriting means for downloading a program sent by broadcasting to rewrite the contents of the first non-volatile memory;  
       an electrically rewritable second non-volatile memory storing identification information indicating whether the program has been normally rewritten by the first program rewriting means or the program has not been normally rewritten by the shutoff of the power during the rewriting;  
       second program rewriting means for checking the identification information when the control portion is activated, and downloading the program sent by broadcasting again to rewrite the contents of the first non-volatile memory when it is detected that the program has not been normally rewritten; and  
       means for changing, when the program has been normally rewritten by the second program rewriting means, the identification information into information indicating that the program has been normally rewritten.  
     
     
       2. The digital television receiver according to claim  1 , further comprising 
       means for initializing the second non-volatile memory when the control portion is first activated after the program is normally rewritten.